module Addressable::URI::CharacterClasses

Container for the character classes specified in <a href=“www.ietf.org/rfc/rfc3986.txt”>RFC 3986</a>.

Note: Concatenated and interpolated ‘String`s are not affected by the

`frozen_string_literal` directive and must be frozen explicitly.

Interpolated `String`s *were* frozen this way before Ruby 3.0:
https://bugs.ruby-lang.org/issues/17104